fireproofsocks
Is there a cleaner way to update a deeply nested struct or map?
I’m working through some test-writing around %Plug.Conn{} and I was wondering if there is an easier syntax for editing deeply nested parts of the struct or map.
For example, I wanted to remove a key from a map, and the best I could do is something like this:
conn = conn_fixture() # e.g. %Plug.Con{:params: %{"email" => "x@y", "and" => "other stuff"}}
params = Map.delete(conn.params, "email")
conn = Map.put(conn, :params, params)
That feels wrong for some reason. Is there a better way?
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al2o3cr
For your specific example, Access is handy:
pop_in conn, [Access.key(:params), :email]
# => {"x@y", new_conn}
shanesveller
For maps specifically you can use Kernel.put_in, pop_in, update_in and friends, but for structs it’s reliant on implementation of the Access protocol and may or may not be present for your use case.
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